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完型填空

阅读下面短文,掌握其大意,然后从以下各题所给的A,B,C,D四个选项中选出可以填入空白处的最佳选项。

  Although vitamin C is an 1 defender of body cells, the vitamin can also play a “dual” (双重的) role 2 , at times, actually damages cells' genetic (遗传的) material, new research 3 . Investigators say their findings 4 help explain why high-dose(剂量) vitamin C has so far 5 as an experimental cancer therapy.

   6 the June 15th issue of Science, researchers at the University of Pennsylvania in Philadelphia 7 on their test-tube experiments 8 that vitamin C is 9 of giving rise to DNA-damaging substances called genotoxins.

  Previous research has shown vitamin C can 10 DNA damage, but the new research demonstrates a 11 avenue (途径,方法) the vitamin can take in doing 12 .

  Moreover, according to lan A. Blair and his colleagues, the 13 may offer one reason why vitamin C has failed to 14 the expectations of some who believe 15 can help treat cancer.

  In the average person, Blair explained in an interview, vitamin C may regularly act as 16 a cell's friend 16 foe (敌人), making a daily megadose (大剂量) of vitamin C 17 to fight illness. “ 18 could be an explanation for 19 a good diet is better than 20 a single vitamin,” he said.

1.

[  ]

A.necessary
B.essential
C.common
D.normal

2.

[  ]

A.or
B.but
C.and
D.yet

3.

[  ]

A.deliver
B.suggested
C.delivering
D.suggests

4.

[  ]

A.could
B.will
C.should
D.can

5.

[  ]

A.tried
B.been tried
C.failed
D.won

6.

[  ]

A.In
B.On
C.About
D.when

7.

[  ]

A.reported
B.report
C.reports
D.reporting

8.

[  ]

A.show
B.shows
C.showing
D.showed

9.

[  ]

A.unable
B.capable
C.incapable
D.important

10.

[  ]

A.promote
B.reduce
C.improve
D.develop

11.

[  ]

A.the same
B.different
C.impossible
D.possible

12.

[  ]

A.good
B.something
C.effects
D.harm

13.

[  ]

A.invention
B.findings
C.scientists
D.University

14.

[  ]

A.meet
B.make
C.stop
D.increase

15.

[  ]

A.it
B.nothing
C.those
D.someone

16.

[  ]

A.not …but…
B.both… and…
C.whether…or…
D.neither…nor…

17.

[  ]

A.likely
B.unlikely
C.easy
D.difficult

18.

[  ]

A.So
B.Thus
C.This
D.That

19.

[  ]

A.that
B.why
C.what
D.when

20.

[  ]

A.taking
B.take
C.not take
D.not taking
答案:B;C;D;A;C;A;B;C;B;A;B;D;B;A;A;B;B;C;B;A
解析:

B;C;D;A;C;A;B;C;B;A;B;D;B;A;A;B;B;C;B;A

B;C;D;A;C;A;B;C;B;A;B;D;B;A;A;B;B;C;B;A


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【小题1】
A.considerateB.carelessC.stupidD.clever
【小题2】
A.what ifB.how comeC.how aboutD.what for
【小题3】
A.loseB.haveC.winD.beat
【小题4】
A.ShoutingB.GlaringC.StaringD.Pointing
【小题5】
A.whichB.whyC.whenD.how
【小题6】
A.raisedB.metC.answeredD.got
【小题7】
A.intelligenceB.rightC.knowledgeD.strength
【小题8】
A.ThereforeB.StillC.ThusD.However
【小题9】
A.enthusiasticB.curiousC.crazyD.clear
【小题10】
A.ifB.beforeC.unlessD.when
【小题11】
A.cruelB.importantC.disappointedD.necessary
【小题12】
A.attendedB.startedC.finishedD.entered
【小题13】
A.guideB.takeC.bringD.push
【小题14】
A.homeworkB.belongingsC.healthD.rankings
【小题15】
A.inB.byC.withD.on
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A.teachB.deliverC.addressD.face
【小题17】
A.floorB.roadC.bankD.beach
【小题18】
A.quicklyB.suddenlyC.slowlyD.sharply
【小题19】
A.intoB.throughC.acrossD.throughout
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